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Top Forums UNIX for Dummies Questions & Answers Submitting cron job through script Post 302918237 by gandolf989 on Monday 22nd of September 2014 12:15:40 PM
Old 09-22-2014
For what its worth, using a script to create a cron job as the root user may lead to some odd, hard to find and possibly dangerous bugs. You may want to rethink your approach.
 

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ATRUN(8)						    BSD System Manager's Manual 						  ATRUN(8)

NAME
atrun -- run jobs queued for later execution SYNOPSIS
atrun [-l load_avg] [-d] DESCRIPTION
Atrun runs jobs queued by at(1). Root's crontab(5) file /etc/crontab has to contain the line */5 * * * * root /usr/libexec/atrun so that atrun gets invoked every five minutes. At every invocation, atrun will start all the jobs in the lowercase queues whose start time has elapsed. In addition, if the load average over the last minute was less than the specified limit then a maximum of one batch job (denoted by the uppercase queues) is started. Before starting a job, atrun will check the status of its owner's account with pam(3) and refuse to run the job if the account is unavail- able, e.g., locked out or expired. OPTIONS
-l load_avg Specify a limiting load factor, over which batch jobs should not be run, instead of the default of 1.5 * number of active CPUs. -d Debug; print error messages to standard error instead of using syslog(3). WARNINGS
For atrun to work, you have to start up a cron(8) daemon. FILES
/etc/pam.d/atrun pam.conf(5) configuration file for atrun /var/at/jobs Directory containing job files /var/at/spool Directory containing output spool files SEE ALSO
at(1), crontab(1), pam(3), syslog(3), crontab(5), pam.conf(5), cron(8) BUGS
The functionality of atrun should be merged into cron(8). BSD
October 30, 2012 BSD
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